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首页> 外文期刊>International Journal of Electrochemical Science >Corrosion Characteristics of Aluminum in Sodium Bicarbonate Aqueous Solution at 50 °C
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Corrosion Characteristics of Aluminum in Sodium Bicarbonate Aqueous Solution at 50 °C

机译：碳酸氢钠水溶液中铝在50°C下的腐蚀特性

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摘要

This paper considers the corrosion behavior of aluminum in a range of low-concentrationsodium bicarbonate solutions at high temperature (50 °C). Aluminum exhibits enhanced corrosioninhibition (passivation) in low concentration sodium bicarbonate solutions when compared to deionizedwater. It was determined that an aluminum electrode in 1×10 -3 mol L -1 sodium bicarbonate solution (pH7.77) exhibited the lowest corrosion rate based on the lowest measured corrosion current, the mostpositive corrosion potential, and the maximum charge transfer impedance. The corrosion of aluminumwas inhibited in sodium bicarbonate solution because HCO 3 - anions in the solution developed an orderedcharge field at the interface of the aluminum/electrolyte, which limited the diffusion of aluminum ions.This ordered charge fieldmay also enhance the formation of a protective aluminum oxide film, whichcan effectively inhibit the corrosion of aluminum. The scanning electron microscope (SEM), energydispersive spectrometer (EDS) and X-ray diffraction (XRD) confirmed that the corrosion productscovering the surface of the aluminum electrode were Al(OH) 3 and/or Al 2 O 3 . This paper provides a basisfor resolving scaling problems associated with the grading electrode in high-voltage direct currentsystems caused by the corrosion of the aluminum radiator.
机译：本文考虑了在高温（50°C）下一系列低浓度碳酸氢钠溶液中铝的腐蚀行为。与去离子水相比，铝在低浓度的碳酸氢钠溶液中表现出增强的缓蚀作用（钝化作用）。基于最低的测量腐蚀电流，最大的正腐蚀电位和最大的电荷转移阻抗，确定铝电极在1×10 -3 mol L -1碳酸氢钠溶液（pH7.77）中表现出最低的腐蚀速率。碳酸氢钠溶液可抑制铝的腐蚀，因为溶液中的HCO 3-阴离子在铝/电解质界面处形成有序的电荷场，从而限制了铝离子的扩散。该有序的电荷场还可以增强保护性铝的形成。氧化膜，可有效抑制铝的腐蚀。扫描电子显微镜（SEM），能谱仪（EDS）和X射线衍射仪（XRD）证实，覆盖铝电极表面的腐蚀产物是Al（OH）3和/或Al 2 O 3。本文为解决与铝散热器腐蚀引起的高压直流系统中分级电极相关的结垢问题提供了基础。

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